There are a lot of plugins giving money, however none correctly IMO. In all of them (I believe), none are giving more cash to late joiner. So someone joining server and then a team within 10 seconds after round starts (for example) are put at a disadvantage.

Also, there is none letting you choose when to start giving money every rounds (LIONz allows pistol rounds; but you've no choice of it and it lacks the point above).